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"Duplicate declaration" error due to identifier traversal change

See original GitHub issue

Hey Kent 👋

I’m experiencing an import issue in twin.macro that’s popped up in the latest version of babel-plugin-macros (v3.0.0).

I’ve tracked down the change that’s caused the break and noticed it wasn’t described in the change list:

- state.file.scope.path.traverse({
+ traverse(state.file.ast, {
    Identifier() {},
})

It breaks with the following error:

./pages/index.tsx
TypeError: /Users/.../pages/index.tsx: Duplicate declaration "_styled" (This is an error on an internal node. Probably an internal error.)

The error hints at something else due to twin having inserted another styled-components/macro import. (A macro adding another macro ha!)

Here’s the code that inserts the import in twin.macro:

twinImportPath.insertBefore(
    t.importDeclaration(
      [t.importDefaultSpecifier(generateUid('cssPropImport', program))],
      t.stringLiteral(styledComponentsMacroImport)
    )
)

Reference issue: https://github.com/ben-rogerson/twin.macro/issues/241

Issue Analytics

State:
Created 3 years ago
Comments:6

Top GitHub Comments

1reaction

ben-rogersoncommented, Dec 7, 2020

Thanks so much for your fast response and epic digging Conrad 👍

1reaction

conartist6commented, Dec 7, 2020

As usual with babel the documentation consists of tweets: https://twitter.com/sebmck/status/1132038207309172736

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